There's something kind of soulless about this manga that I can't quite pinpoint. Maybe it's the generic characters, or the generic plot, or the "comedy" that's absolutely unfunny and just highlights how the detective is L but Different™ (telling criminals to unalive themselves is different, right?)
But I feel unfair, because the art is nice enough, and the MC has some actual character even though he's the designated yaoi bait. It just feels so tailored to be a successful shonen series that it doesn't really have an identity of its own.
5.5/10, truly generic but no fatal flaws.